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參數(shù)資料
| 型號： | MAX772MJA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Hex Inverter Buffers/Drivers With Open-Collector High-Voltage Outputs 20-LCCC -55 to 125 |
| 中文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, CDIP8 |
| 封裝： | CERDIP-8 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 204K |
| 代理商： | MAX772MJA |
Floating the shunt-regulator ground (SGND) disables
the shunt regulator. To enable it, connect SGND to
GND. The shunt regulator requires 1mA minimum cur-
rent for proper operation; the maximum current must
not exceed 20mA. The MAX773 operates in non-boot-
strapped mode when the shunt regulator is used, and
EXT swings between the 6V shunt-regulator voltage
and GND.
When using the shunt regulator, use an N-channel pow-
er FET instead of an NPN power transistor as the power
switch. Otherwise, excessive base drive will collapse
the shunt regulator.
External Power-T ransistor
Control Circ uitry
PFM Control Scheme
The MAX770–MAX773 use a proprietary current-limited
PFM control scheme to provide high efficiency over a
wide range of load currents. This control scheme com-
bines the ultra-low supply current of PFM converters (or
pulse skippers) with the high full-load efficiency of
PWM converters.
Unlike traditional PFM converters, the MAX770–
MAX773 use a sense resistor to control the peak induc-
tor current. They also operate with high switching
M
5V /12V /15V or Adjustable, High-Efficiency,
Low I
Q
, Step-Up DC-DC Controllers
_______________________________________________________________________________________
9
V+
EXT
CONTROL
1.5V
REFERENCE
Q
TRIG
Q
S
F/F
R
Q
TRIG
LOW-VOLTAGE
OSCILLATOR
2.5V
0.1V
0.2V
ONE-SHOT
ONE-SHOT
CURRENT-SENSE
AMPLIFIER
DUAL-MODE
COMPARATOR
LBO V15
V12
V5
FB
LBI
REF
200mV
ERROR
COMPARATOR
SHDN
V+
SGND
6V
EXTH
EXTL
EXT
MAX770
MAX771
MAX772
CS
MAX773 ONLY
MAX770
MAX771
MAX772
BIAS
CIRCUITRY
N
N
N
MAX770–MAX773
MAX773
ONLY
Figure 1. Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX770CPA | 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers |
| MAX770CSA | 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers |
| MAX770EPA | 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers |
| MAX770ESA | 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers |
| MAX770MJA | 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers |
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